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<div class="title">mpmc_blocking_q.h</div>  </div>
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<a href="mpmc__blocking__q_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160; </div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment">// Copyright(c) 2018 Gabi Melman.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment">// Distributed under the MIT License (http://opensource.org/licenses/MIT)</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160; </div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment">// multi producer-multi consumer blocking queue.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment">// enqueue(..) - will block until room found to put the new message.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment">// enqueue_nowait(..) - will return immediately with false if no room left in</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">// the queue.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment">// dequeue_for(..) - will block until the queue is not empty or timeout have</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment">// passed.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160; </div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="circular__q_8h.html">spdlog/details/circular_q.h</a>&quot;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160; </div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="preprocessor">#include &lt;condition_variable&gt;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#include &lt;mutex&gt;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160; </div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">namespace </span><a class="code" href="namespacespdlog.html">spdlog</a> {</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="keyword">namespace </span>details {</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160; </div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="keyword">template</span>&lt;<span class="keyword">typename</span> T&gt;</div>
<div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html">   24</a></span>&#160;<span class="keyword">class </span><a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html">mpmc_blocking_queue</a></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;{</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="keyword">public</span>:</div>
<div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#abb22a6f25c5fd96af5b163dc93eec397">   27</a></span>&#160;    <span class="keyword">using</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#abb22a6f25c5fd96af5b163dc93eec397">item_type</a> = T;</div>
<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#ace609561c8f631202988ec49f95422fa">   28</a></span>&#160;    <span class="keyword">explicit</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#ace609561c8f631202988ec49f95422fa">mpmc_blocking_queue</a>(<span class="keywordtype">size_t</span> max_items)</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;        : q_(max_items)</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    {</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    }</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160; </div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="preprocessor">#ifndef __MINGW32__</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    <span class="comment">// try to enqueue and block if no room left</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a3795640b651fcb2de66a21ef2bc221f1">   35</a></span>&#160;    <span class="keywordtype">void</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a3795640b651fcb2de66a21ef2bc221f1">enqueue</a>(T &amp;&amp;item)</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    {</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        {</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;            std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;            pop_cv_.wait(lock, [<span class="keyword">this</span>] { <span class="keywordflow">return</span> !this-&gt;q_.full(); });</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;            q_.push_back(std::move(item));</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;        }</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        push_cv_.notify_one();</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    }</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160; </div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="comment">// enqueue immediately. overrun oldest message in the queue if no room left.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a1280489c9035a705f50f04905a5ed394">   46</a></span>&#160;    <span class="keywordtype">void</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a1280489c9035a705f50f04905a5ed394">enqueue_nowait</a>(T &amp;&amp;item)</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    {</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        {</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;            std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;            q_.push_back(std::move(item));</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;        }</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        push_cv_.notify_one();</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    }</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160; </div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    <span class="comment">// try to dequeue item. if no item found. wait upto timeout and try again</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    <span class="comment">// Return true, if succeeded dequeue item, false otherwise</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#af4015ea1657b393755f34d76c97a28d1">   57</a></span>&#160;    <span class="keywordtype">bool</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#af4015ea1657b393755f34d76c97a28d1">dequeue_for</a>(T &amp;popped_item, std::chrono::milliseconds wait_duration)</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    {</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;        {</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;            std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;            <span class="keywordflow">if</span> (!push_cv_.wait_for(lock, wait_duration, [<span class="keyword">this</span>] { return !this-&gt;q_.empty(); }))</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;            {</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;                <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;            }</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;            q_.pop_front(popped_item);</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;        }</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        pop_cv_.notify_one();</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    }</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160; </div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    <span class="comment">// apparently mingw deadlocks if the mutex is released before cv.notify_one(),</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <span class="comment">// so release the mutex at the very end each function.</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160; </div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    <span class="comment">// try to enqueue and block if no room left</span></div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a3795640b651fcb2de66a21ef2bc221f1">enqueue</a>(T &amp;&amp;item)</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    {</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;        std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;        pop_cv_.wait(lock, [<span class="keyword">this</span>] { <span class="keywordflow">return</span> !this-&gt;q_.full(); });</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        q_.push_back(std::move(item));</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        push_cv_.notify_one();</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    }</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160; </div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    <span class="comment">// enqueue immediately. overrun oldest message in the queue if no room left.</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="keywordtype">void</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a1280489c9035a705f50f04905a5ed394">enqueue_nowait</a>(T &amp;&amp;item)</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    {</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;        std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;        q_.push_back(std::move(item));</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        push_cv_.notify_one();</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    }</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160; </div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    <span class="comment">// try to dequeue item. if no item found. wait upto timeout and try again</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    <span class="comment">// Return true, if succeeded dequeue item, false otherwise</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="keywordtype">bool</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#af4015ea1657b393755f34d76c97a28d1">dequeue_for</a>(T &amp;popped_item, std::chrono::milliseconds wait_duration)</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    {</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        <span class="keywordflow">if</span> (!push_cv_.wait_for(lock, wait_duration, [<span class="keyword">this</span>] { return !this-&gt;q_.empty(); }))</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;        {</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;            <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;        }</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        q_.pop_front(popped_item);</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        pop_cv_.notify_one();</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    }</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160; </div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160; </div>
<div class="line"><a name="l00108"></a><span class="lineno"><a class="line" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a15e3d12dff953034d5aad5590b8282cd">  108</a></span>&#160;    <span class="keywordtype">size_t</span> <a class="code" href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a15e3d12dff953034d5aad5590b8282cd">overrun_counter</a>()</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    {</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        std::unique_lock&lt;std::mutex&gt; lock(queue_mutex_);</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;        <span class="keywordflow">return</span> q_.overrun_counter();</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    }</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160; </div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="keyword">private</span>:</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;    std::mutex queue_mutex_;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    std::condition_variable push_cv_;</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    std::condition_variable pop_cv_;</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    <a class="code" href="classspdlog_1_1details_1_1circular__q.html">spdlog::details::circular_q&lt;T&gt;</a> q_;</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;};</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;} <span class="comment">// namespace details</span></div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;} <span class="comment">// namespace spdlog</span></div>
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<div class="ttc" id="aclassspdlog_1_1details_1_1mpmc__blocking__queue_html_a3795640b651fcb2de66a21ef2bc221f1"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a3795640b651fcb2de66a21ef2bc221f1">spdlog::details::mpmc_blocking_queue::enqueue</a></div><div class="ttdeci">void enqueue(T &amp;&amp;item)</div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00035">mpmc_blocking_q.h:35</a></div></div>
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<div class="ttc" id="aclassspdlog_1_1details_1_1mpmc__blocking__queue_html_a1280489c9035a705f50f04905a5ed394"><div class="ttname"><a href="classspdlog_1_1details_1_1mpmc__blocking__queue.html#a1280489c9035a705f50f04905a5ed394">spdlog::details::mpmc_blocking_queue::enqueue_nowait</a></div><div class="ttdeci">void enqueue_nowait(T &amp;&amp;item)</div><div class="ttdef"><b>Definition:</b> <a href="mpmc__blocking__q_8h_source.html#l00046">mpmc_blocking_q.h:46</a></div></div>
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